<html>
  <head>
    <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css" />
    <style>
      #demo {
        padding: 0.5em;
      }
    </style>
  </head>
  <body>
    <div id="demo"></div>
    <script src="./demo.js"></script>
  </body>
</html>
